If you simply avoid foods like these, you would probably lose weight without doing anything else:
#1 - Foods with a high fat and carb combination
Because carbs cause our body to store fat, foods that are high in fat AND carbs are going to cause weight gain unless you eat them in small amounts.
Examples: pizza, biscuits, cheesy foods, mashed potatoes, gravy, corndogs, creamy foods/soups/sauces, donuts, pies, cake, desserts, chips, junk food in general, carnival foods like nachos, pretzels, popcorn, etc.
#2 - Sugar
We eat too much sugar in general. The kind of sugar we eat is not a natural food. It has been stripped and processed to the point that it actually uses up minerals from our body's resources to process it. It is literally taking nutrients from your body!
Sugar is not only high in calories but also void of nutrients. It doesn't satisfy our bodies nutritional needs, which results in your body asking for more food!
Don't forget the large amounts of sugar in your drinks: sodas, coffee, juice, tea, etc.
#3 - Carbs
We do need carbs in our diet, but we eat too many and the wrong kind. Simple carbs (white flour, sugar) taste the best and are what most carbs are made of, but they are nutritionally void (have been stripped of their nutrients through processing). They not only cause weight gain, but are a large part of what's making us sick.
Try to choose complex carbs (with whole grains) as much as possible.
Example of problem carbs: muffins, dried fruit, cereal, bagels, white bread, rolls, white pasta, white rice, potatoes, etc.
The easiest way to avoid foods like these is to not let yourself get hungry and eat the stuff that is good for weight loss first. For example: If I can just eat the green beans and turkey first, the roll looks less and less tempting as I get more full.